The Iranian Intelligence Ministry announced on Thursday that its forces have managed to arrest the terrorists who had assassinated the country's two nuclear scientists and a policeman.

Security forces arrested assassins of nuclear scientists Majid Shahriari, Mostafa Ahmadi Roshan and policeman Reza Qashqaei, the ministry said in a statement. The criminals are now under the arrest, it said, adding, "The details of the arrest will be made public after lapse of security precaution."

Iran has so far arrested several suspects in relation to the assassination of its scientists. Western spy agencies, collaborated by the terrorist Mojahedin-e Khalq Organization (MKO), have assassinated several Iranian scientists in the last three years.

In the fifth attack of its kind in two years, terrorists killed a 32-year-old Iranian scientist, Mostafa Ahmadi Roshan, and his driver on January 11. The blast took place on the second anniversary of the martyrdom of Iranian university professor and nuclear scientist, Massoud Ali Mohammadi, who was also assassinated in a terrorist bomb attack in Tehran in January 2010.

The assassination method used in the bombing was similar to the 2010 terrorist bomb attacks against the then university professor, Fereidoun Abbassi Davani - who is now the head of Iran's Atomic Energy Organization - and his colleague Majid Shahriari. While Abbasi Davani survived the attack, Shahriari was martyred.

Another Iranian scientist, Dariush Rezaeinejad, was also assassinated through the same method on 23 July 2011. Reports said that the terrorist attacks on Iran's scientists were joint operations by Israeli spy agents and the MKO.

The NBC News said in a report in February that Mossad has financed and trained the MKO to assassinate Iranian nuclear scientists. Two senior US officials, speaking on the condition of anonymity, confirmed to the NBC News that the MKO was to blame for the series of assassinations against Iranian nuclear scientists.

"All your inclinations are correct," said one of the officials while speaking about the group's role in the assassinations and Tel Aviv's support for the group. The US officials said the US government was aware of the assassination campaign.